Well, there is still another round of unreleased exotics. This list (https://www.reddit.com/r/DestinyTheGame/comments/3lyxef/heres_a_list_of_the_remaining_new_year_2_exotic/) is a bit outdated now as Tarantella and Twilight Garrison at the least are both out now. There are year 2 versions of older exotics in the database that haven't been released yet, too.

Like anon above, I'm also hoping they add some more old strikes to the year 2 playlist. I'm almost certain they'll be adding Summoning Pits at some point as there are two new dead ghosts that are only available during that strike (and a couple more on route to it). I'd like The Nexus and Winter's Run back, too. Anything for more variety.

Other than that, I'm not really sure. Pretty sure there won't be anything more significant until Destiny 2.